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KVM: x86: do not report preemption if the steal time cache is stale
commit c3c28d2 upstream. Commit 7e2175e ("KVM: x86: Fix recording of guest steal time / preempted status", 2021-11-11) open coded the previous call to kvm_map_gfn, but in doing so it dropped the comparison between the cached guest physical address and the one in the MSR. This cause an incorrect cache hit if the guest modifies the steal time address while the memslots remain the same. This can happen with kexec, in which case the preempted bit is written at the address used by the old kernel instead of the old one. Cc: David Woodhouse <dwmw@amazon.co.uk> Cc: stable@vger.kernel.org Fixes: 7e2175e ("KVM: x86: Fix recording of guest steal time / preempted status") Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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